| Traverse Group | |
|---|---|
| Stratigraphic range:Devonian | |
| Type | Group |
| Sub-units | Bell Shale,Rockport Quarry Limestone,Ferron Point Fm, Koehler Limestone, Gravel Point Fm, Charlevoix Limestone, Petoskey Fm, Whiskey Creek Fm, Ten Mile Creek Dolomite |
| Underlies | Antrim Shale andJordan River Formation |
| Overlies | Dundee Formation andRogers City Limestone |
| Thickness | 183 meters |
| Lithology | |
| Other | Limestone |
| Location | |
| Region | |
| Country |  United States |
TheTraverse Group is ageologic group inMichigan,Indiana andOhio comprising middle Devonian limestones with calcareous shale components.[1][2] Its marine fossils notably include Michigan's state stone, thePetoskey stone (the extinct coralHexagonaria percarinata), among other corals and records of ancient marine life. A range oftrilobites has also been found in the Traverse Group.[3]
The Traverse Group outcrops in Emmet and Charlevoix counties along the northwestern shore ofMichigan's lower peninsula. Itsformations areGravel Point,Charlevoix Limestone, Petoskey, and Whiskey Creek.[4] The Gravel Point Formation consists of a lithographic gray to brown limestone with shale beds up to 0.5 meters thick; it also includeschert nodules andbioherms (fossilized reef mounds). The Charlevoix Limestone is a mildly argillaceous limestone with interbeddedcoquina. The Petoskey Formation is an arenaceous limestone named for its locale (Petoskey, Michigan), and contains the eponymous Petoskey stones. The Whiskey Creek Formation is a limestone.
The Traverse Group formed as a shallow carbonate shelf during theDevonian period (~419 to 359 Ma), when the most recentsupercontinent,Pangea, was just beginning to take shape.
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